Automatic RFID circuit tuning

1. A method of printing comprising the steps of: providing a print media having a printing surface; measuring at least one parameter of the print media; calculating an optimal configuration for a radio frequency identification (RFID) transponder circuit, utilizing the at least one parameter, for obtaining a desired RFID transponder resonant frequency; configuring the RFID transponder circuit; and, printing the RFID transponder circuit onto the print media.

2. A method of printing in accordance with claim 1 , wherein the print media is comprised of plastic or paper.

3. A method of printing in accordance with claim 1 , wherein the printing is inkjet printing.

4. A method of printing in accordance with claim 1 , wherein the RFID transponder circuit is comprised of a loop coil or a straight thin film inductor.

5. A method of printing in accordance with claim 1 , wherein the RFID transponder circuit comprises a RFID antenna and resonant L-C circuit and the controller configures the value of the RFID antenna inductance and/or the resonant L-C circuit.

6. A method of printing in accordance with claim 1 , wherein the parameter is capacitance.

7. A method of printing in accordance with claim 1 , wherein the print media is comprised of final packaged goods and the calculating and configuring steps account for goods within the package.

8. A printer comprising: a feeder for feeding print media, the print media having a printing surface; a probe for measuring at least one parameter of the print media; a controller for utilizing the at least one parameter to calculate an optimal configuration for a radio frequency identification (RFID) transponder circuit for obtaining a desired RFID transponder resonant frequency and configuring the RFID transponder circuit; and, a printhead for printing the RFID transponder circuit onto the print media.

9. A printer in accordance with claim 8 , wherein the printhead is an inkjet printhead.

10. A printer in accordance with claim 8 , wherein the RFID transponder circuit is comprised of a loop coil or a straight thin film inductor.

11. A printer in accordance with claim 8 , wherein the RFID transponder circuit comprises a RFID antenna and resonant L-C circuit and the controller configures the value of the RFID antenna inductance and/or the resonant L-C circuit.

12. A printer in accordance with claim 8 , wherein the parameter is capacitance.

13. A method of printing in accordance with claim 8 , wherein the print media is comprised of final packaged goods and the calculating and configuring steps account for goods within the package.